Value transferring mechanism



Sept. 19, 1939. F. PoTT VALUE TRANSFERRING MECHANISM original Filed sept. 23, 1951 5 sneet-sheet 1 -sep1.19, 1939. F30-FT 2,173,636

VALUE TRANSFERRING MECIANISM Original Filed Sept. 23, 1931 5 Sheets-Sheet 2 /NVeNTgR Sept. 19, 1939. F. POTT VALUE TRANSFERRING MECHANISM Original Filed Sept. 23, 1931 5 Sheets-Sheetl 3 Byg Sept. 19, 1939. F. POTT VALUE TRANSFERRING MEcHAmsM 5 Sheets-Sheei 4 original Filed Sept. 23, 1951 Sept. 19, 1939. F, POTT VALUE TRANSFERRING MECHANISM Original Filed Sept. 25, 1931 5 Sheets-Sheet 5 Patented sept. 19, 1939 UNITED STATES VALUEG n msm-len rm, 'nm-inns.

,alsignorto Germain Mercedes Buromalchinen-Werke Aktiengelell schaft, Benshausen. ThurIngia, Germany application September 23, 1931, applicati Original No. 564,643.' Divided and this on Allgust .25, 1933, Serial No. 686,838. In Germany November 28, 1939 7 Claims. (a. :S5-144) This inventionv relates to a resetting mechanism, and is a division of my U. S. application, Ser. No. 564,643, led on September 23, 1931.

Resetting mechanisms of this kind have already become known with regard to such machines, in which the numeral wheels of all decimal places of the accumulator are arranged on the same shaft.

The object ofthe invention is to provide a resetting mechanism on such machines, in which an individual shaft is arranged for each decimal place of the accumulators. o

Preferably the resetting mechanism may be J5 provided with a second resetting operating member for the resetting of the revolution counter,

accumulator and that of the' revolution counter may be either made operative individually or simultaneously by special keys, which in their turn J control a common powery operated clutch.

. In the drawings, one form of construction according to the invention isillustrated by way of example as applied to a Mercedes Euklid calculating machine as described in U. S. Patent 1,011,617.

Fig. 1 shows a front view in perspective of the machine in which for the sake of clearness the cover plates of the carriage and of the machine I are partly removed.

Fig. 2 shows a perspective view of the main driving shaft, with the resetting-clutch, viewed in the direction of the arrow b of the Figure 1 with the parts separated out from one another.

Fig. 3 shows a plan of the numeral wheels of the revolution counter on'an enlarged scale for the purpose of better illustration of the individual mechanisms.y l

Fig. 4 shows a longitudinal section through the carriage and along the lines lL-4a, lb-lb, and Ic-Ic in Fig. 9 viewed in the direction of the arrows at the ends of the sectional lines in Fig. 9. The sections corresponding to lines Ict-4a, lb-ib and lc4c of Fig. 9 are designated in Fig. 4 by a-a, b-b and c-c. Figures 5 and 6 show on an enlarged scale a section and in two diii'erent positions of a lock for preventing overthrow oi the resetting device of the revolution coimter along the line la-Ia of Figure 9, viewed in the opposite direction of the arrows at`the ends of the sectional line Ia-Ia. Fig. 6 shows the pomtion of the parts immediately after the completed resetting process.

4 'viewed in the direction of the arrow c.

Figure 8 shows a side view of a section along whereby both resetting members, viz. that of the.

Figure 'I shows a side view of a detail in Figure the line l-l in Figurei, viewed in the direction of the arrows at the ends of said line.

Figure 9 shows a section along the line 9 9 in Fig. 4, viewed in the direction of the arrows at the ends of .said line. 5

Figure 10 shows a perspective view taken from the rightharid` front of the machine of the keys for the accumulator and revolution counter resetting device in which the resetting clutch for the sake of clearess is drawn out of its true 10 position towards the right.

Fig. 10a. is a'side view of the resetting clutch viewed in the direction of the arrow a of Fig. 10.

The motor (not shown) is removably attached on the rear side of the machine. In Fig. 1, only the cable of the motor is shown. The rotations of the motor, revolving in the direction of the arrow el (Fig. 10) are transferred through a worm l, and a worm wheel 2, to a driving shaft 3, Figure 10. The driving shaft 3 is thus rotated in 20 the direction of the arrow e, Figures 2 and 10.

On the right hand side of the machine, Figures .1 and 10a key board resetting key 6 is disposed,v which is indicated by R, an accumulator resetting key 1 which is-indicated by R and a 25 revolution counter resetting key 8 which is indicated by Rao.

4'I'he shaft 3,-Figures 2 and 10 is as already mentioned driven in the direction of the arrow e -by the worm wheel 2 which engages with\ the 30 worm I.

On the driving shaft 3, a cam 2D, Figure 10,

'formed with a conical circumference, is nonrotatably mounted, said cam coacting with an arm 2i, of a two-armed contact lever 22, the ,5 purpose of which will be later described in a more detailed manner. ,The arm 2| in its rest position lies on the conical circumference 23 of the cam 2l, and is held in this position by means of a spring 2Mb attached at one end to a lug Ila 40 of the arm 2|, of the lever 22, and at its other end to a nose 29M of the lever 255.

On the driving shaft l, Figures 2 and 10, the resetting clutch l) is disposed which is rotatably mounted on the driving shaft 2, while the cam Il,

is fixedon the shaft 2. The clutch disc is fastened to the housing Il by means of screws 86,- Figure 10, which engage with holes 81, Figure 2, and is provided with a hole Il, into which the driving shaft I projects so far that it terminates 50 with the side of the cover disc 95 remote. from the clutch housing Il. In'the housing 83, a clutch pawl Il, Figure 2, is swingably mounted by means of afbolt arranged between the clutch housing Il and the cover disc I6, and

disposed in the holes 9| and 92, and the pawl is acted upon in the clockwise direction, by a spring 95, which is attached to a nose 93 of the pawl 39, and to a pin 94, of the housing 83. A nose 96 of the pawl 89 abuts on a nose 91 (Figure 10, the clutch83 is here for the sake of clearness drawn out on the right) which is formed on an arm 98 of a clutch lever |00 (Fig. 10) swingably mounted on a screw 99. The nosev Figure 2, o the pawl 89, is thereby held out of engagement with the nose |02 of the cam 84, since a.

pawl |04 engages with a groove |03 formed in the clutch housing 83. The pawl |04 is at one of its ends of fork-likev construction, and is swingably mounted in a ring groove of the shaft 99. By means of a spring |05, which on one side is attached to a nose |06 of the pawl 04, and on the other side is secured to a bolt 50a, arranged in the machine frame, the pawlv |84 is acted on in the clockwise direction, Figure 2. ln the housing 83, a groove |01 is further provided, which will be later described in a more detailed manner.

On the cover disc 85, a pin |08 is provided, to which a rod |09, Figure is pivoted( the rod operating the resetting device of the accumulator and revolution counter A and RC, Figure 1.

Resetting clutch for the accumulator and for the revolution counter 0n the housing 83, there is provided a pin ||0,

Figures 2 and 10 which acts on a two-armed in the machine frame. ln its rest position, it

lies with its horizontal arm on two levers of the resetting mechanisms for the accumulator and revolution counter.

1f one of the keys 1 or 8 is depressed-in the present example the key 1 is depressedthe coupling, lever |00 is swung clockwise (as shown in Figure 10a) through the parts 5|5, 5|5b, 520, 522a (Fig. 10) whereby the nose |0| (Fig. 2) of the pawl 89 enters the path of the nose 02 of the cam 84 secured to the driving shaft 3. Since the motor contact 300, 302 (Fig. 10) is closed simultaneousiy with the depression of the key 1, the driving shaft 3 will berotated through the gears l, 2 and the clutch housing 83 (Fig. 10a) rotated in the direction of the arrow e whereupon at the beginning of the rotation, the pawl |04 is swung clockwise against the action of the spring I 05. During the rotation of the housing 83, the pawl |04 moves on the periphery of the clutch housing. As soon as the key 1 is released, the nose 91 of the leverv |00 again enters thepath of the nose 96 of the pawl 89. Prior to the completion ,of one ofthe complete rotations of the clutch housing 83, the nose 91 of the lever |00 acts on the nose 96 of the-pawl 89 whereby it is swung anti-clockwise against' the action of the spring 95 (as shown in Fig. 2). 'I'he nose |0|'of the pawl 89 is now disengaged from the nose |02 `of the cam 84. Owing to the torque of the clutch casing 83, the latter will be rotated until the pawl |04 again engages in the groove |03 of' the clutch casing 83 whereby a rearward rotation of the latter is prevented and it is held in its position of rest.

, On the right-hand side of the machine, besides the addition key stem 239, Figure 1, and the subtraction key stem 353, the mechanism for releasing the keys depressed in the keyboard K, the resetting mechanism of the revolution-counter RC, and of the accumulator A are also arranged, which will be described in detail in the following.

Keyboard releasing mechanism The key 5 for releasing the depressed keys, which bears the reference R, Figures 1 and 10, is provided on a stem 505, which is guided in the guide plate 238 andfby means of a screw (not shown) engaging an elongated hole 506 in a vertically slidable manner. A spring 501 connected to the stem 505 holds the slide'505 in its normal position, which is determined by the impact of the end 508, ofthe elongated hole 506, against the screw (not shown) engaged therewith. 'Ihe stem 505 acts in its downward movement with its face 509 on the face 510, of an arm 59|, of the key resetting rail 3|8 swingable on the shaft 26|. 'I'he rail 3|8 lies with its face 3|8a, Figure 10, against projection 5|4a, of the known key locking bar 5|4.

Resettng mechanism for the accumulator The resetting key 1, Figure 10, provided with the reference RA, for the resetting of the aocumulator A, Figure 1, is arranged on a| key lever 5| 5, which is disposed so as to be swingable on a shaft 516, mounted in bearings in the guide frame 238. The lever 5|5 by means of a bridge SI1, is rigidly connected with the lever 5 8, which likewise is swingable on the shaft 5|6. On the lever 5|8, a lug 5|8a, is provided, to which one end of a spring 5|8b is attached the spring at its other end being connected to a lug, not shown, of the guide plate 238, whereby the lever 5|5., is held in its rest position, which is determined by the impact of the edge 5|5a, upwards against the guide plate 238. To the downwardly directed limb 5|5b, of the lever 5|5, a connecting rod 5|9 is jointed, which in turn, is jointed to a lever 520. This lever 520 is swingably mounted at the point 52| round a shaft, which is not shown. An arm 522 of the lever 520 acts with its part 522a upwards on an arm 523 of the two-armed clutch lever |00, which by means of its U-shaped part |00a, is swingably mounted on the screw 99. To an arm 523 of the clutch lever |00, a. pin 524 is attached, to which pin one end of a spring 525 is connected, which at its other end is attached to JKa pin 525, provided on the machine frame, and holds the clutch lever 00 in its normal position, which is determined by the impact of a Ufshaped lug 521 provided on the arm 523, of the clutch lever |00, on an intermediate wall of the machine frame. The nose 91 of the arm 88 of the lever |00 is connected in the already described manner, to the clutch 83. The face 5200 of the lever 520, Figure 10, acts on the roller 292, provided on the lever 29|, whereby the motor contact 300/302 is closed by means of the parts 29|, 295 and 22.

The already mentioned lug 304 of the clutch lever 43, Figure 10, can enter into a recess formed by the noses 528 and 529, so that the lever 520 on the depression of thekey 1, can swing round the point 52|, without acting upon the clutch lever 43. The arm 53| of the lever 520 acts on screw 531 on a. lever 538. 0n the lever 539 a u pin 540 is riveted, to which a spring 54| is attached which with its other end is connected to a pin 542of the lever 538.

The spring 54| acts upon the lever 539 in the clockwise direction round the screw 531,. Through contact of the face '536, of the lever 539, on the lever 532, which lies upwardly against the arm `53| of the lever 520, the normal position of the parts 532, 539 is determined. The U-shaped end 539a, of the lever 539, embraces a bar 544, fastened to the machine frame at the points 543. 'I'he angled lug 545, on the lever 539 may slide in a manner to be ldescribed later in detail on the bar 544.

'I'he alreadymentioned lever 538 is rigidly mounted on the shaft 546, which is rotatably mounted in bearings in the machine frame. On the other end of the shaft 546, a further lever 541 is xed in a similar manner, which by means of the screw 548 is in pivotal connection with the rod |09 of the resetting clutch 85.

The part 539a, of the U-shaped lever 539, on the depression of the resetting key 1, engages in the slots 5490. (Figs. 4, 5, 6) of a comb 549, which is xed on the resetting bar 550 of the accumulator A, Figure v1. The resetting bar 550 is displaceably mounted in the grooves 55|a, Figure 7, of the boxes 55|, which are provided on the rear wall Cr of the carriage .C. Further, the resetting bar 550 is mounted in a ring groove sleeve 550b, attached to the rear wall Cr of the carriage C, Figures 4 and 8, by means of a screw 550a. By means of a spring 549e, which is attached at one of its ends to a pin 5491 Figure 4, of the comb 549, and at its other end, to an angle piece 552, Figure 8, of the carriage C, the resetting bar 550 is held in the rest position illustrated in Figure 4. The teeth 550d of the resetting bar 550, engage with toothed wheels 553, rotatable on the shafts 498. The toothed wheels 553 act on the toothed wheels 555 in case that the numeral wheels 554 of the accumulator A do not stand at and the resetting bar 550 is actuated, which toothed wheels 555 are rigidly mounted on the numeral wheel shaft 556, on which likewise the numeral wheels 554 and the toothed wheels 551, 558 and |55 are rigidly mounted. If the numeral wheels 554 are at zero,` the toothed wheels 555 fixed on the numeral wheel shaft 556 stand with their broad toothless spaces 555a, Figure 4, opposite to the spaces 553a (Figures 8 and 9) of the tooth wheel 553 formed by the removal of a tooth on half its tooth width. Therefore, the wheels 555, can rotate freely Without acting upon the wheels 553 and in the rotation of the wheels 553 the wheels 555 remain inoperative, as soon as the numeral wheels 554 stand at zero, in which case the spaces 555a and 5530. as shown in Figure 4 lie opposite to one another.

If on the other hand, the numeral wheels 554, Figures 8 and 9 of the vaccumulator A are not at zero, and if the resetting bar 550, Figure 4, is dis- A placed in the direction of the arrow d, the wheels action is particularly of importance in a power driven resetting device.

Reaettink;v mechanism for the revolution counter Near the resetting key 1, Figure 10, for the accumulator A, the resetting key 8 (Rae) for the revolution counter RC is arranged. This is provided on a key lever 560, which is swingably mounted on the shaft |6. By means of a bridge 56|, the key lever 560 is rigidly connected with a lever 562, similarly swingable on the shaft 5|6. By means of a spring, not shown, which at one end is attached to a lug 56|a, formed on the bridge 56|, and at the other end is connected to a lug, not shown, of the guide plate 238, the key lever 560 is acted upon in the anti-clockwise direction and held in its rest position, which is determined by the impact of the edge v560:1 of the key lever 560, upwards against the guide plate 238.

On the downwardly directed limb 563, ofthe lever 560, a connecting rod 564 is jointed, which is jointed also to lever 566, swingably mounted at the point 565. The arm 566a of the lever 566,

. acts with its part 56617 upwards on arm 523 of the clutch lever |00. Into the recess 56'9, formed by the noses 561A and 568, the already mentioned lug 304'of the clutch lever 43, Figure 10, may enter, so that the lever 566 on the depression of the key 8, can swing round the point 565, in the clockwise direction without being impeded by the lug 304 of the clutch lever 43.

The arm 510 of the lever 566, acts on an arm 51| of the two-armed lever 512, whichis swingably mounted on a screw 513 on the machine frame. On the screw 513 a two-armed lever 514, is also swingably mounted. By means of a spring 515, which is connected at one of'its ends to av y nose 516 of the arm 511, of the lever 512, and at its other end to a nose 518 of and arm 519 of the lever 514, the lever 512is acted upon in anti-clockwise direction and the lever 514 in the clockwise direction, whereby the lug 519a, of the arm 519 of the lever 514 lies against a right angled bent' lug 512a, of the arm 511 of the lever 512, and the normal position of the levers 512 and 514 in relation to one another is determined. .On the arm 580, Figure 10 of the lever 514, a lug 58| is bent at right angles on its free end, which lug lies upwards against a lever 583swingably mounted on a screw 582 on the lever 538. By means of a spring 584, which at one of its ends is connected to a pin 585,' of the lever 583, and at its other end is attached to a pin586 of the lever 538, the

lever 583 is acted upon in the clockwise direction, round a screw 582, whereby 'the lever lies on the lug 58| of the lever 514. In this manner its normal position is determined.

IThe U-formed end of the lever 583 embraces a bar 588, fastened by means of screws 581 on the machine frame. The lug 589a, formed on the lever 583, may slide, on the bar 588, whereby the U-shaped part 589 may engage the grooves 590a, Figure 4, of a resetting bar 590, for the revolution counter RC and move this to and fro. The resetting bar 590 is displaceably mounted in grooves 5901), Figure 5, of both boxes Figure 4, and is held upwards by means of screws 59| and parts 59|a. By means of a spring 592, which at one of its ends is attached to the pin 593 on the bar 590 and at its other end to the left box 55|, the bar 590 is held in its normal position,

` which is determined by the impact of the face 5902: of the resetting bar 590 against the part 59|a, provided on the left hand box 55|.

The teeth-59011 of the resetting bar 580 engage with twelve-toothedwheels 596, Figures 5 and 6,

resetting clutch 83, the pin oi' the clutch 83 acts on the arm ||2a of the lever H2, and swings this in the clockwise direction against the action of the spring ||5.. The lever |2 then releases the nose 520g, of the lever 520, whereby this under they action of the spring 5|8b, engaging the arm 5|8 of the key lever 5|5, returns as well as the remaining mechanism into their rest p0- sition.

This arrangement has the object in the case of too short strokes of the key 1, to hold the lever 520 outswung until'the lever 539 with its lug 545, has run up on the bar 544g.

In the depression of the resetting key 1, for the accumulator A, the following are the locks which come into operation.

As already described the lever 520, Figure 10, has been swung in the clockwise direction. On this, the lug 304 of the clutch lever 43, Figure l0, for the value entering clutch, and the 'carriage shift clutch engages with the rec'ess 530 of the lever 520, whereby in the depression of an operating key, the clutch lever 43'cannot swing-out, and in this manner cannot close either the value entering clutch or the carriage shift clutch. The value entering and carriage clutches are not shown or described herein since they are .not a necessary part of the invention but are disclosed in the previously referred to parent case.

'I'he operation of the resetting mechanism for `the revolution counter is as follows:

On the depression of the resetting key 8 (Rao) for the revolution counter RC, the key lever 560, Figure l0 is swung round the shaft 5|6 against the spring not shown, engaging with bridge 56|, in the clockwise direction, The connecting rod 564, jointed to its downwardly projecting limb 563, moves, in the opposite direction of the arrow a. This swings the lever 566, jointed to it, round the point 565 in the clockwise direction, whereby the arm 5660, of the lever 566, acts with its part 5661 upwards against the arm 523, of the clutch lever 00, and in consequence of this swings it round the screw 99 in the clockwise direction Iagainst the action of` the spring 525. 'I'he nose 91, of the arm 98, of the clutch lever |00, releases the nose 96 of the pawl 89, of the resetting clutch 83whereby in the manner already described, the clutch 83 is closed.

-The arm 510 of the lever 566, Figure. 10, acts on the swinging of the lever.566, in the clockwise direction downwards on the arm 51| of the lever upwards against lever 583, swingable on the lever.

538, by means of the screw 582, and swings this against theaction of the spring 584 in the anticlockwise direction. The U-formed part 589 of the lever 583 engages in one of the slots 590a of the resetting bar'590, Figures 4, 7, lying directly opposite to it. d v,

In theswinging of thelever 566, Figure l0, in

`vthe clockwise direction, the edge 566, acts on the roller 292, arranged on the lever 29|,- whereby` over the already previously mentioned parts 294, 295, 22, the motor contact 300, 302, is closed and the motor commences to run in the direction of the arrow el.

As now the motor contact 300, 302, and they resetting clutch 83, Figures 2 and l0, by release of the nose 96, of the pawl 89, are closed by the clutch lever |00, the clutch 83 thus rotates in the direction -of the arrow e, whereby the pin |08 fastened to the clutch disc 85, Figure 2, through the parts |09, 541, 546, 538, moves the lever.583, Figure 10, to and fro, whereby the lug 589a slides on the face 588g of the part 588, whilst the lever 539, jointed to the lever 538, by means of the screw 531, slides with its U-formed part 539e, on the face 544g, of the part 544, without exercising any action on any part.

As already described, the lever 583, Figure l0, moves to and fro, and is positively held in engagement with the slot 590a of the resetting bar 580 for the time being, Figures 4 and '7. Consequently also, this bar is moved to and fro, and at the commencement always in the direction of the arrow d. With this, the resetting wheels 596, Figure 5, are rotated out of the position represented in Figure 5, into that illustrated in Figure 6, and carry along with them all the toothed wheels 591, not at zero, so far in the direction of the arrow h until the space 591a of the same lies opposite to the wheels 596, which is always the case, if the resetting bar 590 has taken up the position shown in Figure 6. As the wheels 591, Figure 6, by means of the sleeve 591e, Figure 9, are rigidly connected with the wheels 206, and as these are in engagement with the Wheels 208, the latter are rotated in the direction of the arrow g andv rotate to zero the numeral wheels 205 rigidly connected with them of the revolution counter RC. An overthrow of the numeral wheels 205 beyond zero is prevented through the meeting of the cams 591|), Figure 6, on the hubs 596C of the wheels 596.

Holding of the resetting key 8 depressed for a longer time does no damage, as hereby the resetting wheels 596 are only moved backwards and i forwards idly by the rack 590, as they'in consequence of the spaces 581a, lying opposite to them, Figure 6, are no longer able to exercise any action on the toothed wheels 591. f

In the .swinging of the lever 566, Figure l0, in the clockwise direction, the angle lever ||2 is able to snap behind the nose 566g, of the lever 566, and to hold this in its out-swung position. After approximately half arotation of the resetting clutch 83,/the pin ||0 of the clutch '83, acts on the arm ||2a of the lever ||2 and swings this against the action of its spring ||5, whereby it releases the nose 566g of the lever 566, so that the lever 566, is returned into its rest position under the action of the spring (not shown) engaging with the lever |00.

This arrangement vfulfills the same object as resetting the key 1 above described. In the de' pression of the resetting key 8, for the revolu'- tion counter RC, the lockings whichl occur are the same as described with regard to the operation of the resetting mechanism for the accumulator.

,Resettng mechanism for the keyboard The key locking bars are moved against the action of its spring and the depressed keys released.

I claim:

l. In a calculating machine, a carriage, nu-

meral wheels on said carriage, a mutilated gear wheel for each of said numeral wheels, a member common toy all of said mutilated gear wheels to causethe latter to reset said numeral wheels to zero, `a motor driven shaft, means operated by said shaft and movable into operative relation tosaid resetting member for actuating the latter, and means for moving the actuating means into operative relation with said resetting member in any position of the carriage.

2. In a calculating machine, a carriage, numeral wheels on said carriage, a mutilated gear wheel for each of said numeral wheels, a member common to all of said mutilated gear wheels to cause the latter to reset the numeral wheels to zero position, a motor driven shaft, and means Aincluding a clutch and operating members for operating said resetting member, a key, said clutch being controlled by said key and driven by said shaft, said operating members being operable by said clutch and engageable with said resetting member by said key upon depression thereof in any position of the carriage.

3. In a calculating'rnachine, a carriage, nu-

meral wheels on said carriage, a mutilated gear member, said actuating means including two members, one of the last mentioned members coacting with said guide member when the actuating means is in inoperative position and the other of said last mentioned members coacting with said guide means upon initiation of actuation of the actuating means to retain the latter in operative position.

4, In a calculating machine, a carriage. numeral wheels on said carriage. a mutilated gear wheel for each of said numeral wheels, a member common to all of said vmutilated gear wheels to cause the latter to reset said numeral wheels to zero position, a motor contact, a motor driven shaft, a clutch on said shaft. a clutch lever for said clutch, pperating means connected with said clutch and engageable with said resetting member, a key operated three-armed lever, means operative to close the motor contact one of the arms of said lever being operative to actuate the closing means, the second arm operating saidclutch lever, and the third arm being adapted to bring the operating means into engagement with said resetting member.

- means for locking said key controlled means in operative position, and means on said clutch to release said locking means.

6. A calculating machine as claimed in claim 4 characterized by the provision of a pair of independently movable levers interposed between the third mentioned arm of said three-armed lever and said operating means, and yieldable means connecting the last mentioned levers together for resiliently imparting movement of one lever to the other lever and then to the operating means.

7. In-a calculating machine, a carriage, numeral wheels on said carriage, a member common toxall of said numeral wheels and operable to reset the latter to zero position, a motor driven shaft, such resetting member having slots therein, means operated by said shaft and engageable in said slots for actuating said resetting member, and means for moving said actuating means into operative relation with the slots of the resetting member in all positions of the carriage,

said moving means including a yieldable connection permitting movement thereof under tension independently of the actuating means.

FRIEDRICH PO'IT. 

